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Videos de Conceptos Relacionados

Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
5.1K
Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

9.0K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
9.0K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

3.7K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
3.7K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.7K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.7K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.8K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.8K
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

10.2K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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La secuencia de adición-funcionalización C-H enantioselectiva produce hexanos 3-Azabiciclo[3.1.0] densamente

Julia Pedroni1, Nicolai Cramer1

  • 1Laboratory of Asymmetric Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Lausanne, Switzerland.

Journal of the American Chemical Society
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Resumen

Este estudio presenta un nuevo método para la creación de compuestos bicíclicos fluorados mediante catálisis de paladio. El proceso permite la síntesis eficiente de derivados de pirrolidina complejos a través de la funcionalización C-H.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Química medicinal

Sus antecedentes:

  • El desarrollo de rutas sintéticas eficientes para moléculas orgánicas complejas es crucial en el descubrimiento de fármacos y la ciencia de los materiales.
  • Los compuestos que contienen perfluoroalquilo poseen propiedades únicas valiosas en productos farmacéuticos y agroquímicos.
  • La síntesis enantioselectiva es esencial para producir fármacos de un solo enantiómero con mejores perfiles de eficacia y seguridad.

Objetivo del estudio:

  • Para revelar una nueva estrategia de funcionalización de C-H enantioselectiva para la síntesis de 3-azabiciclo [3.1.0] hexanos que contienen perfluoroalquilo.
  • Establecer un método modular y eficiente para la construcción de pirrolidinas altamente sustituidas.

Principales métodos:

  • Utilizando un ligando de diazaphospholane modular y estable en el banco para la funcionalización de C-H de ciclopropano catalizado por paladio.
  • Utilizando cloruros de trifluoroacetimidilo como socios electrófilos.
  • Realización de reacciones de un solo recipiente de los productos cíclicos de ketimina resultantes con varios nucleófilos.

Principales resultados:

  • Se ha logrado una funcionalización altamente enantioselectiva del ciclopropano C-H.
  • Se han sintetizado con éxito hexanos 3-azabiciclo [3.1.0] que contienen perfluoroalquilo.
  • Demostró la construcción rápida y modular de pirrolidinas fuertemente sustituidas a partir de los intermediarios de cetimina cíclica.

Conclusiones:

  • El método desarrollado proporciona una vía eficiente y enantioselectiva a los valiosos andamios cíclicos fluorados.
  • Este enfoque permite la síntesis modular de diversos derivados de pirrolidina altamente sustituidos.
  • La metodología tiene potencial para aplicaciones en química medicinal y en la síntesis de nuevos materiales fluorados.